I just purchased a Focus 2012 S a few weeks ago. I had no idea that this was possible since the way the console is designed, just did a random google search. Originally, I was going to buy a bluetooth adapter. However, if I can replace the stereo and add bluetooth capability while also keeping the same appearance...I'll go that route. I also noticed that there is a Focus 2012 cruise control kit, which I would probably add on too.
I have no automotive skills, but good at following instruction manuals. The cruise control I'd probably leave to a mechanic...how easy/hard is it to install? Do you void the warranty by doing this? Looking forward to see what people come up with.